Hbnby j



Oct. 2, 1923.

v Re.v1'v7,091

H. J. KASCH MEANS Fon sscunus xuos Arm Duns-'go Insfmuun'r sHAFTs'Original Filed July 5`, ).924

Reimed oa.. 2, 192s.

UNITED STATES may a.

Re.. 1,7.;,091v

PATENTorrlcaif IASCH, l' DAYTON, OHIO, ASSIGNOB TO IURZ-XASCH COMPANY,OF\ SOUTH l BROADWAY, NEAR DAYTON, OHIO', A CORPGBATION OF O HIO.

-miamiron sncunme xNons AND :ms 'ro ms'raunanr sm'rs.

origini no. Lacasse, ama December 1, ma, semi no. 723,951, ma my s,-icm. Appunti for,"

p reissue lled J\anuary 88,

The invention relates to new and useful improvements in means forsecuring knobs and dials to instrument shafts, and more particularly tomeans for securing a knob and 5 a dial to a cylindrical shaft orspindle, in`

radio apparatus.

It is one of the principal objects of my invention to provide a loosemember, such as a tapered bushing, for firmly securing a knob and dial,or a knob, on an instrument shaft.

In those cases where the knob and dial are made integral `and secured inposition on the shaft by set screws, the operation of the latter isdiicult because of their inaccessible positions. These set screws alsogive the device a rough appearance.

My loose grip ing member, which may take the form o a tapered splitbushing, will not only close in tightly u on the shaft when the knob isturned, but wi l not mar the appearance of the device because of itsentirely concealedposition therein. It Will also present a largegripping or contact surface to the shaft. A

In radio apparatus especially,- mfy loose o carryin stock,

bushing will obviate the necessity ing dials with diierent sized holesfor only bushings with different sized holes need be kept on hand withdials having a one-sized hole to receive them. Thus, lsince diiferentsized holes can be formed in the bushing to accommodate differentdiameter shafts, it becomes a more economical proposition to carrybushings wit-h different sized .35 holes in stock to fit shafts ofdifferent diameters, than to carry different dials with the bushingsmolded in as at present.

My loose tapered bushing may also be provided with a key to engage theshaft, or it 40 may be made solid, with Aholes provided to receive ballsthat engage the shaft. In any event, my method of pulling on the bushingto cause it, or the key, or the balls to close( in on the shaftr is moreadvantageous than the set screw or other methods now employed forsecuring a knob and a dial, or a knob, to an instrument shaft, c,

In theaccompanying drawings, Fig. 1 is a l front view of a combined knoband dial em- 5o bodying my improvements. Fig. 2 is, a side the loosetapered s is a central sect-iena view taken through an'- 192s. serialNo. sans.

view thereof. 'Fi ure 3 is a centralv sectlonal view taken .t roughthesame, showing lit bushing. Figure 4.

other type of my device. Figure 5 is a central sectiona view takenthrough a combined knob and dial employing my ball type of loosebushing. Figure 6l is a central ysectional view taken through a combinedknob and dial employing my loose tapered bushing in conjunction withaWoodruf key. And'Figure 7 is a central sectional view taken throu l1 ya two part knob employing my yloose sp it bushing that is closed inagainst the shaft by turning `the outer part of they knob when the innerpart is held stationary.

Referring to the accompanying drawings for a detailed description of thediii'erent forms of embodiment of m invention, the numeral 1 designatesadia and 2 a knob, for adjusting a spindle or shaft 3 of any type, butmore particularly'that of a radio instrument. (Seek Figures 1, 2 and 3.)The extent of this adjustment is determined by a series of graduations4, formed on the outer periphery of the dial. The latter may be made ofbakelite, metal, a rubber composition or any other suitable substance,and 'has anintegral hub or axial extension 5, in which there is formed atapering axial hole 6. The knob 2, which is preferably made of bakeliteor the like, is formedwith an inner tubular lextension 7 having an axialhole 8, which is' threaded at its inner end./ The tubular extension 7terminates at its 'inner end in an annular iiange 9 adapted to engagethe hub portion 5 of the dial 1, with its hole 8 in registry with -theaxial hole v6 in said hub i portion of the dial to receive the outer exl10.. The inner part outer surface drawn -'against the the shaft withoutthe use of an unsightly and inconvenient set screw.

In Figure 4 I have illustrated a Vernier type knob, through the face ofwhich the hole 8n extends to receive a Vernier shaft 11. The bushing 10shown in/ this figure and in Figure 3, has its tapered port-ion split toenable it to close in readily against the shaft y3 when `the rknob isturned, but in the case now to be described the loose bushing may beformed without the slits in its tapered portion.

Referring to Figure 5, it will be noted that the loose bushing 10 isnot; split, but has formed around the inner edge of its taperingportion, a Ynumber of holes 12, which are counterbored to receive andretain balls 13 which project through the inner Vreduced oriiices ofsuch counter-bored holes, so that when the knob is turned as beforedescribed, the balls will engage the shaft 3 to firmly secure the dialand knob thereon. In other words, when the knob 2 is turned, thetaperingportion of the bushing will be drawn against the tapered' wall of thehole 6 1n the dial 1 to force the balls 13 into clutching engagementwith the shaft.

In Figure 6 the tapered loose bushing 10 is not split, but is formedwith an inner concave hole to receive a Woodruff key. 14, which when theknob is turned as before, will engage the shaft 3. In other words, whenthe knob 2 is turned, the tapered portion of the bushing will be drawnagainst the tapered wall of the hole 6 in the dial, to force the key 14into clutching engagement with the shaft, thereby to hold the knob anddial firmly on the latter.

In Figure 7, I have shown a knob, which is made in two parts, the outerpart 15 having an inner tubular extension 16, which is internallythreaded, and the inner part 17 having a tapering axial hole. When theouter part 15 ofthe knob is placed upon its inner part 17, as in Figure7, a loose lbushing 18'having its outer end externally threaded and itsinner end tapering and split, may beforced through the axial hole-in theinner part 17 of the knob to receive a shaft 19. The outer knob part 1 5may then be .screwed on the outer threaded portion of the bushing 18,'to draw its tapering portion against the tapered wall of the axial holein the inner knob part 17, to cause the split tapering portion of thebushing to firmly clutch the shaft 18-and thereby firmly vsecure bothknob parts upon the shaft.

While the invention 'has been illustrated as applied to a circular dialcarrying a series of graduations for cooperation with a stationary gagemark or pointer, it is to be understood that itis applicable to acontrary construction wherein a pointer member is to be connected uponthe shaft or spindle for cooperation with a stationary series ofgraduations.

Having described my invention, I claim:

1. In a device of the type described, the combination with a shaft, of aknob and a dial for conjoint use in turning the shaft, the dial having'a tapering axial hole and the knob having a tubular extension adaptedto be brought over said hole, a loose bushing having a tapered, splitend adapted to be contracted within said hole, and having its oppositeend threaded for connection with the tubular extension on the knob,whereby when the knob is turned, the tapered end ofthe bushing will becontracted tightly-about the shaft, for the purpose speciiied.

2. The-combination of an indicator member having a hub provided with atapered bore converging outwardly toward the front face of the indicatormember, a tapered split bushing fitted within the tapered bore andterminating at its outer and small end in an exteriorly screw threadedextension projecting be- 'yond said hub, and an adjusting member screwthreaded upon said extension and bearing upon thevhub to draw Athetapered bushing f toward the frontl face of said indicator member intothe tapered bore of such hub, thereby contracting such split bushinginto engagement with a stem surrounded by the bushm0.

t. Means for engaging an indicator and adjustment knob with the spindleof a radio del vice or the like, including an outwardly convergingconical bushing longitudinally slotted and compressible into clampingengagement with the spindle which extends within the'bushing, saidconical slotted bushing terminatingy in a. screw threadedneck at itsapex extremity, an indicator member having an outwardly convergingopening therein, through which the conical bushing extends, and anadjusting member at the outer side of said indicator, having screwthreaded engagementwith such neck and bearing upon the indicator memberto contract the bushing upon the spindle by drawing such slotted conicalbushing longitudinally outwardly within the opening in the indicatormember.

4. Means for connecting an indicator and adjustment knob with each otherand with a spindleof a radio apparatus or the like having a spindle tobe rotated, of an indicator the indicator member to-engage 'said'spindle andindicator, member in their relative posi- A ,tions ofrevoluble adjustment.

5. Meansfor connecting an indicator and adustment knob 'with each otherand with a spindle of a radio apparatus or the like, havl. ing a spindle to be rotated, of an indicator pered couplin engagement by thecoupling'sleeve.

(i.K Means for connecting an indicator with a spindle of a radioapparatus and the like, comprising a revoluble indica-tor havingradially disposed indicating means formed integral with the head, an`independent adjusting knob for. said indicator, and a coupling mem- 'beradjustably engageable with a shaft to be rotated, comprising aconicalbushing-invdependent of said indicator, screw threaded at itssmaller end and longitudinally slotted at its vlarger end, the indicatorhaving therein a tapered central opening in Which'the slotted portion ofthe bushing engages with its screw threaded smaller end projectingthrough andbeyo'nd the front face of the rotary indicator and vintoengagement with the y, adjusting knob, said coupling member beingoperative'- ly engaged with the shaft and the rotary indicator bytheaxial adjustment of the coupling member relative thereto to maintain`said parts in fixed relation with each other by the relative adjustmentof the knob.

, 7. Means-,f r connecting an indicator with a spindle of radioapparatus and the like, comprisi l A noliccon ensa'tion material, anindependent- Emdi'cator formed from phelyl formed' knob 'for rotatingAthe indicator and clutch means projecting beyond the front y face ofsaid indicator for fixedl securing the "indicatorvupon the shaft Ltorotated, comprising a conical bushing screw threaded at its smaller end,and longitudinally slotted at its larger end, said-indicator havingthereina taperedo ening in which the slotted'portion of the cutch isseated and wherein it is contracted upon the engaged shaft by Arelativeaxial adjustment of the indicator and conical bushing, said knob havingscrew threaded engagement with the smaller end of said conical, saidclutch means, and abutting upon said indicator.

`8. Means for securing knobs and dials to instrument shafts-of-radioapparatus and the like, including an indicator molded from phenoliccondensation material or the like,

comprising a head poi-tion having a central orifice and an indicatingmeans carried thereby in radially disposed relation Iupon the head, saidhead having therein a tapered opening,'a conical clutchelement-engageable with the 'shaft to be rotated and axially adjustablewithin the tapered opening, sai conical clutch element being screwthreaded at its smaller extremity and 'a coacting member having screwthreaded engagement with such smallerfend of the clutch element andabutting upon the indicatorto relatively adjust tlie indicator andclutch element in an axial direction to effect clutching engagement uponthe' shaft to be rotated.

9. Means for connecting an indicator with l a spindle of a `radioapparatus and the like,

comprising an indicator member molded from phenolic condensationmaterialqor the like, having a projecting hub provided with a conicalbore, converging. forwardly from its rear toward its forward side, acontractible bushing within the conical bore and projecting beyond thefront face of said indicator member, and means engageable with theforward projecting portions of said contractible bushing for drawing thebushing axially relative to the indicator member in a forwardlydirection, for contracting said bushing upon a shaft inserted therein tolock the indicator member in fixedv relation therewith. l0. Means forsecuring knobs and dials to instrument shafts of radio apparatus and theI like, including an indicator member molded from phenolic condensationmaterial having a projecting hub provided with a conical -i boreconverging from its rear toward its front face, and open at its oppositeends for the reception of a shaft clutching device.

flu.

11.l As an article of manufacture, a couj sleeve engageable within aconical bore, of an indicatingmember, said tapered sleeve havingat itssmaller end, an exte-riorly screw member for securing lan indicator `infixed position upon a` revoluble shaft, comprising an exteriorly taperedcontractiblethreaded neck projecting beyond the front face of theindicating member forengage-Y ment with an adjusting'memberrb which thetapered sleeve is axially adjusta le rel`a` tive to the indicator, thetapered portion of i the sleeve being longitudinally slotted from thelarger terminal thereof to a'point in proximity to the screw threadedneck.

12. Means for securing knobs and dials to instrument shafts of radio aparatus and the like, includingr an indicator or radio apparatus and thelike, including an exteriorly tapered sleeve terminating at its smallerend in an exteriorly threaded neck, the sleeve being longitudinallyslotted from the larger end to a point in proximity to the threadedneck,

lib

an indicator member'having therein a conical bore conyerging forwardlyvfrom its rear to 4 y Y p 17,091

itsdforward face, in which the tapered sleeve direction relative to theindicator member, Ahas expansive Wedging pressure, upon forand therebycontracted within the tapered ward longitudinal movement, and anyindebore yinto gripping engagement with a shaft 1 pendent adjustingmember havin screw' to be turned. 5 threaded engagement with the threaed neck In testimony whereof, I have hereuntoset of said sleeve at theforward side of saidinmy .hand this-22nd day of January, 1926.

dicator member, by the adjustment of which thesleeve is adjustedaxially'in a forwardly HENRY J. KASCH

